Question

saloni took place of burning charcoal and collected gas envolved in a test tube how will she finc the nature of gas

Answer 1

on burning charcoal it gives out carbon dioxide . we can test in two ways . 
1.we can pass it through lime water and if the lime water turns milky it means that it is CO2
2.we can hold a candle to the mouth of test tube if it extinguishes it means that it is carbon dioxide